I tried your calls to NSFont in Objective-C, and it also crashes. Looking at the stack trace, I see that it crashes in CFCharacterSetHasMemberInPlane. I see documentation for thePlane parameter of this function says:
The valid value range is from 0 to 16. If the value is outside of the valid plane number range, the behavior is undefined. I guess randomly crashing counts as undefined behavior. While it would be great if this function was more robust, Apple is definitely saying Don’t Do That. Doug Hill https://github.com/djfitz/SFFontFeatures <https://github.com/djfitz/SFFontFeatures> > On Jun 13, 2017, at 9:42 AM, Jens Persson via swift-users > <swift-users@swift.org> wrote: > > PS > There are only 17 planes in the (current?) Unicode standard, but I'm assuming > that the CharacterSet.hasMember(inPlane:) shouldn't (randomly?) crash for > UInt8 values other than 0 ... 16? > It also seems strange that it reproducibly crashes or not depending on which > specific font I use. > > > On Tue, Jun 13, 2017 at 4:00 PM, Jens Persson <j...@bitcycle.com > <mailto:j...@bitcycle.com>> wrote: > The below program demonstrates a possible bug that I encountered. > Can anyone else reproduce my results (as explained in the comments)? > If so, is it a Swift or Cocoa bug (I haven't tried it in Objective C)? > > import AppKit > > extension NSFont { > var planesWithMembers: [UInt8] { > return (UInt8(0) ... UInt8(255)).filter { > // The follwing line will crash (EXC_BAD_ACCESS) for some fonts: > coveredCharacterSet.hasMember(inPlane: $0) > // I have tested it with Xcode 8.3.3 and Xcode 9 beta 1, both > // Swift 3 and 4, and they all reproduce the crash. > // macOS 10.12.5 > } > } > } > > // Examples that will not cause the crash: > // let fontName = "AlBayan" > // let fontName = "AppleBraille" > // let fontName = "Chalkboard" > // let fontName = "Helvetica" > // let fontName = "Zapfino" > > // Examples that will cause the crash: > // let fontName = "AppleColorEmoji" > // let fontName = "AppleSymbols" > let fontName = "Baskerville" > // let fontName = "Geneva" > // let fontName = "SnellRoundhand" > > let font = NSFont(name: fontName, size: 12)! > let result = font.planesWithMembers > print("Planes that contains members:", result) > > > _______________________________________________ > swift-users mailing list > swift-users@swift.org > https://lists.swift.org/mailman/listinfo/swift-users
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